Water footprint

The water footprint shows the extent of water use in relation to consumption by people.  The water footprint of an individual, community or business is defined as the total volume of fresh water used to produce the goods and services consumed by the individual or community or produced by the business. Water use is measured in water volume consumed (evaporated) and/or polluted per unit of time. A water footprint can be calculated for any well-defined group of consumers (e.g., an individual, family, village, city, province, state or nation) or producers (e.g., a public organization, private enterprise or economic sector), for a single process (such as growing rice) or for any product or service.

Traditionally, water use has been approached from the production side, by quantifying the following three columns of water use: water withdrawals in the domestic, agricultural and industrial sector. While this does provide valuable data, it is a limited way of looking at water use in a globalised world, in which products are not always consumed in their country of origin. International trade of agricultural and industrial products in effect creates a global flow of virtual water, or embodied water(akin to the concept of embodied energy).

In 2002, the water footprint concept was introduced in order to have a consumption-based indicator of water use, that could provide useful information in addition to the traditional production-sector-based indicators of water use. It is analogous to the ecological footprint concept introduced in the 1990s. The water footprint is a geographically explicit indicator, not only showing volumes of water use and pollution, but also the locations.  Thus, it gives a grasp on how economic choices and processes influence the availability of adequate water resources and other ecological realities across the globe (and vice versa).

Water availability

Globally, about 4 percent of precipitation falling on land each year (about 117,000 km3 (28,000 cu mi)),  is used by rain-fed agriculture and about half is subject to evaporation and transpiration in forests and other natural or quasi-natural landscapes.  The remainder, which goes to groundwater replenishment and surface runoff, is sometimes called “total actual renewable freshwater resources”. Its magnitude was in 2012 estimated at 52,579 km3 (12,614 cu mi)/year.  It represents water that can be used either in-stream or after withdrawal from surface and groundwater sources. Of this remainder, about 3,918 km3 (940 cu mi) were withdrawn in 2007, of which 2,722 km3 (653 cu mi), or 69 percent, were used by agriculture, and 734 km3 (176 cu mi), or 19 percent, by other industry. Most agricultural use of withdrawn water is for irrigation, which uses about percent of total actual renewable freshwater resources.  World water use has been growing rapidly in the last hundred years.